There was a conversation in the comments about which Y chromosomal lineages clearly descend from “Ancient Ancestral South Indians,” the people who have strong affinities to the eastern wave out of Africa. Though Y chromosomal lineage H is strongly localized to South Asia, it seems to have deep Pleistocene connections to West Asia, so that is not a clear candidate. Many “eastern” Y haplogroups have connections to East Asians, so it is not often clear which of the others might be AASI.
Reading a paper on Australian Aboriginal genetics clarified things. Many South Asian groups with no East Asian ancestry carry Y haplogroup C (e.g., Patels), which diversified 50,000 years ago between Australian/Papuans and Indians. This is clearly a reflection of deep-time connections across southern Eurasia and into Oceania.